Status Effect

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A Status Effect, or commonly called a Proc (an abbreviation of "Programmed random occurrence"), is an additional effect which may be triggered at random by a hit from a weapon or Warframe power. Status Chance is the probability that a hit will inflict a status effect. The base duration of the Proc will depend on its type, and whether the target is an enemy or another Tenno.

Each damage type is associated with a status effect. Weapons that deal multiple damage types will have a separate chance to inflict its associated status effect on a target, and only one damage type can proc per hit. See the Damage 2.0 Overview Table for information on which status effects are associated with which damage types.

For example, a weapon such as an unmodified Tysis deals solely Corrosive damage. In addition to its damage, Tysis also has a 50% status chance on each shot to cause a proc. On a successful proc, the enemy will receive the Corrosive status effect, which removes a percentage of armor over the duration of the effect. Warframe abilities usually have a high chance to proc, or in some cases, 100% chance to inflict the status effect (e.g. Frost's Ice Wave ability).

Enemies also possess the ability to inflict status effects on Tenno. For example, a GrineerScorch has a chance to inflict the Ignited status effect with the Heat damage from his Ignis. Similarly, enemies are also able to inflict physical procs such as Bleeding (associated with Slash damage) directly to the player's health.

Most statuses have a duration over which their effects apply to their target (aside from Corrosive), and some of them even deal damage over time. A status effect's duration can be increased or decreased, along with the total number of ticks in the case of damage-over-time procs, if the target's speed is altered by a warframe power (such as Molecular Prime or Rest & Rage) according to the following formulas:

Status chance can be a key factor in deciding on a weapon of choice. Some effects are very powerful responses to certain enemies (Corrosive procs are valued highly against heavily armored foes) while other damage types have generally underwhelming effects (players will generally ignore the status chance of a Magnetic weapon due to its limited benefits).

The chance that a proc will occur can be directly increased with mods such as Rifle Aptitude. One can also increase the number of projectiles fired through multishot mods such as Split Chamber; this effectively increases the opportunities for an enemy to be procced per a given attack, and is reflected in the weapon's attributes box in the Arsenal screen. Another indirect source of proccing is to increase fire rate, which doesn't increase the likelihood that a proc will occur per attack, but increases the number of possible procs in a given time frame.

Physical damage procs ( Knockback, Weaken, and Bleed) will occur in proportion to the amount of base damage dealt by each of the three physical damage types (Impact, Puncture, and Slash) on the weapon. For example, the Strun's highest physical damage type is Impact, thus it inflicts more knockback procs than bleed or weaken procs.

When both physical and elemental damage types are present on a weapon (such as a base physical damage weapon with elemental mods equipped), physical damage types are weighted four times as much as elemental types are in the proc calculation, making elemental procs relatively rarer. This does not affect weapons without base physical damage; for those weapons, the chances of any given proc occurring should be directly proportional to its damage amount. Increasing the physical or elemental damage of a weapon does not increase the duration of the associated proc (e.g. enemies won't be confused longer if Radiation damage is increased).

To determine the proportional chance for each damage type to proc, multiply each physical damage type (if any) by 4 to get the proportional damage and add them together. Next, add to this the damage for each elemental damage type (if any) to get the total proportional damage. Then take each of the previous proportional damage type amounts and divide by the total proportional damage to get the proc chance for each.

When firing multiple pellets in a single attack, the status chance on a listed weapon in the Arsenal is actually the calculated probability that at least one of its pellets will proc. For example, the Strun Wraith displays a 40% status chance, but in fact has a ~4.98% chance for each of its ten pellets.

To calculate the status chance of a single pellet, the following formula is needed:

Status Chance is the base status chance of the weapon listed in the Arsenal.

Status Multipliers refers to status chance bonuses granted to the player through mods; Toxic Barrage grants an additional 60% status chance which would increase a weapon's base status chance from 40% to 0.40 × (1 + 0.60) = 64%. In this case, the Status Multiplier is (1 + 0.60).

Base Number of Pellets refers to the unmodded amount of pellets fired per shot.

The above equation shows that for weapons with innate multishot, 100% status chance will result in all pellets having a 100% proc chance. This is an important fact because a status chance below 100% greatly reduces the proc chance per pellet.

The status of a weapon listed in the Arsenal is the probability that any shot or strike with that weapon can be calculated using the following formula:

Modified Number of Pellets refers to the modded amount of pellets fired per shot.

When more than one status in different pellets of the same shot can have an effect (e.g. Corrosive procs), it is more important to know the expected value of status effects per shot instead. This value can be determined with the following formula:

Statuses Triggered = Number of Pellets × Chance per Pellet

Statuses Triggered refers to the average number of status effects triggered per shot.

When looking at the effect of multishot mods on overall status chance of weapons with or without innate multishot, one can use the following expression:

Status Probability is the probability to proc at least once in a single round. This value is the listed status chance shown in the Arsenal.

Multishot Multipliers are the multishot bonuses granted to the player through mods; Hell's Chamber grants an additional 120% multishot which would increase a weapon's base number of pellets from 10 to 10 × (1 + 1.20) = 22. In this case, the Multishot Multiplier is (1 + 1.20).

Because bonus status chance mods affect the chance that at least one projectile will inflict a status effect (rather than the Chance per Pellet), weapons with large numbers of pellets get dramatically stronger when they reach 100% status chance. The table below explains this: the damage from procs is related to the number of procs. Compare the number of procs at 100% against the number of procs at 99%. The developers could fairly easily fix this by making the status chance instead based on the chance per pellet. This would likewise make most shotguns stronger, as they would get larger numbers of procs without reaching the magical 100% status chance.

Status chance behaves differently for continuous weapons (i.e. Flux Rifle, Embolist etc.). Multishot has no effect on the status chance, and also has no effect on the rate of damage. Instead, each damage tick has a chance for extra damage based on the amount of multishot.

Increasing the firing rate of a continuous weapon increases its in-game status/sec by an equal amount. +100% firing rate, for example, doubles the Status/Sec. This combines with bonus status effects:

Because all continuous weapons inherently have four ticks per second, the status chance per damage tick is simply the weapon's Status/Sec divided four:

Chance per Tick = (Status/Sec) ÷ 4

Despite the fact that continuous weapons displayed status/sec can go above 100%, this does not actually guarantee a status proc every second. Because of the formula above regarding chance per tick, the actual chance per second is similar to the formula used above for multishot weapons:

Actual chance per second = 1 − (1 − Chance per Tick)4

For example, if the modded status chance for your weapon is 100%, then the status chance per tick is only 25%. If you wanted to attain 100% status chance per tick, you would need to increase the status/sec to 400%. This is currently only possible on the Cycron using the following mods while aiming after an ability cast: Frostbite, Jolt, Scorch, Pistol Pestilence, Lethal Torrent, Anemic Agility, Gunslinger, and Embedded Catalyzer. This would not be particularly desirable, however, because the Cycron's small magazine would be expended in a little over a second.

The in-game Status/Sec is still useful for determining how long you have to wait to get a status effect. The average number of procs per second is equal to the Status/Sec. For example, a weapon with 200% Status/Sec would get, on average, 2 procs per second. The time between status procs is the inverse of this; a weapon with 200% status chance can expect to wait one-half second before getting a status proc, while a weapon with 50% status chance can expect to wait two seconds before getting a status proc.

In Hotfix 11.0.2, damage type icons were added and will appear beside damage ticks to indicate that a proc has been inflicted. Note that this does not show multiple Impact procs caused by a single shot.